What is alinguistic fact?

MLA

Labov, William. What Is Alinguistic Fact?. Lisse: De Ridder, 1975.

APA

Labov, W. (1975). What is alinguistic fact?. Lisse: De Ridder.

Chicago

Labov, William, What Is Alinguistic Fact?. Lisse: De Ridder, 1975.